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GNU Emacs NEWS -- history of user-visible changes.

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Copyright (C) 2017-2020 Free Software Foundation, Inc.
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See the end of the file for license conditions.

Please send Emacs bug reports to 'bug-gnu-emacs@gnu.org'.
If possible, use 'M-x report-emacs-bug'.

This file is about changes in Emacs version 27.

See file HISTORY for a list of GNU Emacs versions and release dates.
See files NEWS.26, NEWS.25, ..., NEWS.18, and NEWS.1-17 for changes
in older Emacs versions.

You can narrow news to a specific version by calling 'view-emacs-news'
with a prefix argument or by typing 'C-u C-h C-n'.

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Temporary note:
+++ indicates that all relevant manuals in doc/ have been updated.
--- means no change in the manuals is needed.
When you add a new item, use the appropriate mark if you are sure it
applies, and please also update docstrings as needed.

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* Installation Changes in Emacs 27.1

27
---
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** Emacs now uses GMP, the GNU Multiple Precision library.
By default, if 'configure' does not find a suitable libgmp, it
arranges for the included mini-gmp library to be built and used.
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The new configure option '--without-libgmp' uses mini-gmp even if a
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suitable libgmp is available.

** Emacs can now use HarfBuzz as its shaping engine.
The new configure option '--with-harfbuzz' adds support for the
HarfBuzz text shaping engine.  It is on by default; use './configure
--without-harfbuzz' to build without it.  The HarfBuzz text shaping is
available via new font backend drivers 'xfthb' and 'ftcrhb' for Xft
and Cairo drawings, respectively, and via the 'harfbuzz' backend on
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MS-Windows.  The HarfBuzz text shaping is preferred to the previously
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supported ones, so the font backends that use older shaping engines
(FLT on GNU and Unix systems and Uniscribe on MS-Windows) are not
enabled by default; they can be enabled via the 'font-backend' frame
parameter or via X resources.

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** The new configure option '--with-json' adds native support for JSON.
This uses the Jansson library.  The option is on by default; use
'./configure --with-json=no' to build without Jansson support.  The
new JSON functions 'json-serialize', 'json-insert',
'json-parse-string', and 'json-parse-buffer' are typically much faster
than their Lisp counterparts from json.el.
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** The configure option '--with-cairo' is no longer experimental.
This builds Emacs with Cairo drawing, and supports built-in printing
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when Emacs is built with GTK+.  Some severe bugs in this build were
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fixed, and we can therefore offer this to users without caveats.  Note
that building with Cairo enabled results in using Pango instead of
libXft for font support, and that Pango 1.44 has removed support for
bitmapped fonts.
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61
+++
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** Emacs now uses a "portable dumper" instead of unexec.
This improves compatibility with memory allocation on modern systems,
and in particular better supports the Address Space Layout
Randomization (ASLR) feature, a security technique used by most modern
operating systems.

When built with the portable dumping support (which is the default),
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Emacs looks for the "emacs.pdmp" file, generated during the build, in
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its data directory at startup, and loads the dumped state from there.
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The new command-line argument '--dump-file=FILE' allows specifying a
non-default ".pdmp" file to load the state from; see the node
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"(emacs) Initial Options" in the Emacs manual for more information.
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An Emacs started via a dump file can create a new dump file only if it
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was invoked with the '-batch' option.  (This is a temporary
limitation; we plan on lifting it in a future release.)
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Although the portable dumper has been tested, it may have a bug on
unusual platforms.  If you require traditional unexec dumping you can
use the configure-time option '--with-dumping=unexec'; however, please
file a bug report describing the situation, as unexec dumping is
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deprecated, and we plan on removing it in some future release.
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** The new configure option '--enable-checking=structs' attempts to
check that the portable dumper code has been updated to match the last
change to one of the data structures that it relies on.

** The configure options '--enable-checking=conslist' and
'--enable-checking=xmallocoverrun' have been withdrawn.  The former
made Emacs irredeemably slow, and the latter made it crash.  Neither
option was useful with modern debugging tools such as AddressSanitizer.
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(See "etc/DEBUG" for the details of using the modern replacements of the
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removed configure options.)

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** Emacs no longer defaults to using ImageMagick to display images.
This is due to security and stability concerns with ImageMagick.  To
override the default, use 'configure --with-imagemagick'.

** Several configure options now accept an option-argument 'ifavailable'.
For example, './configure --with-xpm=ifavailable' now configures Emacs
to attempt to use libxpm but to continue building even if libxpm is
absent.  The other affected options are '--with-gif', '--with-gnutls',
'--with-jpeg', '--with-png', and '--with-tiff'.

** The 'etags' program now uses the C library's regular expression matcher.
If it's possible, 'etags' will use the regexp matcher from the
system's standard C library, otherwise it will be linked with a
compatible regex substitute.  This lets developers maintain Emacs's
own regex code without having to also support other programs.  The new
configure option '--without-included-regex' forces 'etags' to use the C
library's regex matcher even if the regex substitute ordinarily would
be used to work around compatibility problems.

** Emacs has been ported to the '-fcheck-pointer-bounds' option of GCC.
This causes Emacs to check bounds of some arrays addressed by its
internal pointers, which can be helpful when debugging the Emacs
interpreter or modules that it uses.  If your platform supports it you
can enable it when configuring, e.g., './configure CFLAGS="-g3 -O2
-mmpx -fcheck-pointer-bounds"' on Intel MPX platforms.

** Emacs now normally uses a C pointer type instead of a C integer
type to implement Lisp_Object, which is the fundamental machine word
type internal to the Emacs Lisp interpreter.  This change aims to
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catch typos and supports '-fcheck-pointer-bounds'.  The configure
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option '--enable-check-lisp-object-type' is therefore no longer as
useful and so is no longer enabled by default in developer builds,
to reduce differences between developer and production builds.

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** The distribution tarball now has test cases; 'make check' runs them.
This is intended mostly to help developers.

** Emacs now requires GTK 2.24 and GTK 3.10 for the GTK 2 and GTK 3
builds respectively.

** New make target 'help' shows a summary of common make targets.

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** Emacs now builds with dynamic module support by default.
Pass '--without-modules' to 'configure' to disable dynamic module
support.
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** The ftx font backend driver is now obsolete and will be removed in
Emacs 28.

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* Startup Changes in Emacs 27.1

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** Emacs can now use the XDG convention for init files.
The 'XDG_CONFIG_HOME' environment variable (which defaults to
"~/.config") specifies the XDG configuration parent directory.  Emacs
checks for "init.el" and other configuration files inside the "emacs"
subdirectory of 'XDG_CONFIG_HOME', i.e. "$XDG_CONFIG_HOME/emacs/init.el"
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However, Emacs will still initially look for init files in their
traditional locations if "~/.emacs.d" or "~/.emacs" exist, even if
"$XDG_CONFIG_HOME/emacs" also exists.  This means that you must delete
or rename any existing "~/.emacs.d" and "~/.emacs" to enable use of
the XDG directory.
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If "~/.emacs.d" does not exist, and Emacs has decided to use it
(i.e. "$XDG_CONFIG_HOME/emacs" does not exist), Emacs will create it.
Emacs will never create "$XDG_CONFIG_HOME/emacs".
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Whichever directory Emacs decides to use, it will set
'user-emacs-directory' to point to it.
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** Emacs can now be configured using an early init file.
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The file is called "early-init.el", in 'user-emacs-directory'.  It is
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loaded very early in the startup process: before graphical elements
such as the tool bar are initialized, and before the package manager
is initialized.  The primary purpose is to allow customizing how the
package system is initialized given that initialization now happens
before loading the regular init file (see below).

We recommend against putting any customizations in this file that
don't need to be set up before initializing installed add-on packages,
because the early init file is read too early into the startup
process, and some important parts of the Emacs session, such as
'window-system' and other GUI features, are not yet set up, which could
make some customization fail to work.

** Installed packages are now activated *before* loading the init file.
As a result of this change, it is no longer necessary to call
'package-initialize' in your init file.

Previously, a call to 'package-initialize' was automatically inserted
into the init file when Emacs was started.  This call can now safely
be removed.  Alternatively, if you want to ensure that your init file
is still compatible with earlier versions of Emacs, change it to:

(when (< emacs-major-version 27)
  (package-initialize))

However, if your init file changes the values of 'package-load-list'
or 'package-user-dir', or sets 'package-enable-at-startup' to nil then
it won't work right without some adjustment:
- You can move that code to the early init file (see above), so those
  settings apply before Emacs tries to activate the packages.
- You can use the new 'package-quickstart' so activation of packages
  does not need to pay attention to 'package-load-list' or
  'package-user-dir' any more.

** Emacs now notifies systemd when startup finishes or shutdown begins.
Units that are ordered after 'emacs.service' will only be started
after Emacs has finished initialization and is ready for use.
(If your Emacs is installed in a non-standard location and you copied the
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emacs.service file to e.g. "~/.config/systemd/user/", you will need to copy
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the new version of the file again.)


* Changes in Emacs 27.1

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** Emacs now supports Unicode Standard version 13.0.

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** Emacs now supports resizing and rotating images without ImageMagick.
All modern systems support this feature.  (On GNU and Unix systems,
Cairo drawing or the XRender extension to X11 is required for this to
be available; the configure script will test for it and, if found,
enable scaling.)

The new function 'image-transforms-p' can be used to test whether any
given frame supports these capabilities.

** The Network Security Manager now allows more fine-grained control
of what checks to run via the 'network-security-protocol-checks'
user option.

** TLS connections have their security tightened by default.
Most of the checks for outdated, believed-to-be-weak TLS algorithms
and ciphers are now switched on by default.  (In addition, several new
TLS weaknesses are now warned about.)  By default, the NSM will
flag connections using these weak algorithms and ask users whether to
allow them.  To get the old behavior back (where certificates are
checked for validity, but no warnings about weak cryptography are
issued), you can either set 'network-security-protocol-checks' to nil,
or adjust the elements in that user option to only happen on the 'high'
security level (assuming you use the 'medium' level).

** New user option 'nsm-trust-local-network'.
Allows skipping Network Security Manager checks for hosts on your
local subnet(s).  It defaults to nil.  Usually, there should be no
need to set this non-nil, and doing that risks opening your local
network connections to attacks.  So be sure you know what you are
doing before changing the value.

** Native GnuTLS connections can now use client certificates.
Previously, this support was only available when using the external
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'gnutls-cli' or 'starttls' command.  Call 'open-network-stream' with
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':client-certificate t' to trigger looking up of per-server
certificates via 'auth-source'.

** New user option 'network-stream-use-client-certificates'.
When non-nil, 'open-network-stream' performs lookups of client
certificates using 'auth-source' as if ':client-certificate t' were
specified if there is no explicit ':client-certificate' parameter.
Defaults to nil.

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** 'next/previous-multiframe-window' have been renamed.
The new names are as follows:

 'next-multiframe-window'     -> 'next-window-any-frame'
 'previous-multiframe-window' -> 'previous-window-any-frame'

The old function names are maintained as aliases for backward
compatibility.

** emacsclient
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*** emacsclient now supports the 'EMACS_SOCKET_NAME' environment variable.
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The command-line argument '--socket-name' overrides it.
(The same behavior as for the pre-existing 'EMACS_SERVER_FILE' variable.)

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*** Emacs and emacsclient now default to "$XDG_RUNTIME_DIR/emacs".
This is used as the directory for client/server sockets, if Emacs is
running on a platform or environment that sets the 'XDG_RUNTIME_DIR'
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environment variable to indicate where session sockets should go.
To get the old, less-secure behavior, you can set the
'EMACS_SOCKET_NAME' environment variable to an appropriate value.

*** When run by root, emacsclient no longer connects to non-root sockets.
(Instead you can use Tramp methods to run root commands in a non-root Emacs.)

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** 'xft-ignore-color-fonts' now ignores even more color fonts.
There are color fonts that managed to bypass the existing checks,
causing XFT crashes, they are now filtered out.  Setting
'xft-ignore-color-fonts' to nil removes those checks, which might
require setting 'face-ignored-fonts' to filter out problematic fonts.
Known problematic fonts are "Noto Color Emoji" and "Emoji One".

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** The GTK+ font chooser now respects 'face-ignored-fonts'.
When using 'menu-set-font' under GTK3, the available fonts are now
matched against 'face-ignored-fonts'.

** The GTK+ font chooser now remembers the previously selected settings.
It now remembers the name, size, style, etc.

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** New user option 'what-cursor-show-names'.
When non-nil, 'what-cursor-position' will show the name of the character
in addition to the decimal/hex/octal representation.  Default nil.

** New function 'network-lookup-address-info'.
This does IPv4 and/or IPv6 address lookups on hostnames.

** 'network-interface-list' can now return IPv4 and IPv6 addresses.
IPv4 and IPv6 addresses are now returned by default if available,
optionally including netmask/broadcast address information.

** Control of the threshold for using the 'distant-foreground' color.
The threshold for color distance below which the 'distant-foreground'
color of the face will be used instead of the foreground color can now
be controlled via the new variable 'face-near-same-color-threshold'.
The default value is 30000, as the previously hard-coded threshold.

** The function 'read-passwd' uses "*" as default character to hide passwords.

** The function 'read-answer' now accepts not only single character
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answers, but also function keys like 'F1', character events such as
'C-M-h', and control characters like 'C-h'.
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** Lexical binding is now used by default when evaluating interactive Elisp.
More specifically, 'lexical-binding' is now used by default for 'M-:'
and '--eval' (including in evaluations invoked from 'emacsclient' via
its '--eval' command-line option), as well as in
'lisp-interaction-mode' and 'ielm-mode', used in the "*scratch*" and
"*ielm*" buffers.
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We envision that most Lisp code is already either written with
lexical-binding in mind, or will work unchanged under
lexical-binding.  If, for some reason, your code used in 'M-:' or
'--eval' doesn't work as result of this change, either modify the code
to work with lexical binding, or wrap it in an extra level of 'eval'.
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For example, --eval "FORM" becomes --eval "(eval 'FORM)" (note the extra
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quote in 'FORM).

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** The new user option 'tooltip-resize-echo-area' avoids truncating
tooltip text on GUI frames when tooltips are displayed in the echo
area.  Instead, it resizes the echo area as needed to accommodate the
full tool-tip text.

** Show mode line tooltips only if the corresponding action applies.
Customize the user option 'mode-line-default-help-echo' to restore the
old behavior where the tooltip text is also shown when the
corresponding action does not apply.

** New hook 'server-after-make-frame-hook'.
This hook is a convenient place to perform initializations in daemon
mode which require GUI features to be available.  One example is
restoration of the previous session using the desktop.el package: put
the call to 'desktop-read' in this hook, if you want the GUI settings
to be restored, or if desktop.el needs to interact with you during
restoration of the session.

** The functions 'set-frame-height' and 'set-frame-width' are now
commands, and will set the currently selected frame to the height/
width specified by the numeric prefix.

** New function 'logcount' calculates an integer's Hamming weight.

** New function 'libxml-available-p'.
This function returns non-nil if libxml support is both compiled in
and available at run time.  Lisp programs should use this function to
detect built-in libxml support, instead of testing for that
indirectly, e.g., by checking that functions like
'libxml-parse-html-region' return nil.

** 'libxml-parse-xml-region' and 'libxml-parse-html-region' take
a parameter that's called DISCARD-COMMENTS, but it really only
discards the top-level comment.  Therefore this parameter is now
obsolete, and the new utility function 'xml-remove-comments' can be
used to remove comments before calling the libxml functions to parse
the data.

** A new DOM (the XML/HTML document structure returned by functions
such as 'libxml-parse-html-region') traversal function has been added:
'dom-search', which takes a DOM and a predicate and returns all nodes
that match.

** New function 'fill-polish-nobreak-p', to be used in 'fill-nobreak-predicate'.
It blocks line breaking after a one-letter word, also in the case when
this word is preceded by a non-space, but non-alphanumeric character.

** The limit on repetitions in regexps has been raised to 2^16-1.
It was previously limited to 2^15-1.  For example, the following
regular expression was previously invalid, but is now accepted:

   x\{32768\}

** The German prefix and postfix input methods now support Capital sharp S.

** New input methods 'hawaiian-postfix' and 'hawaiian-prefix'.

** New input methods 'georgian-qwerty' and 'georgian-nuskhuri'.

** New input methods for several variants of the Sami language.
The Sami input methods include: 'norwegian-sami-prefix',
'bergsland-hasselbrink-sami-prefix', 'southern-sami-prefix',
'ume-sami-prefix', 'northern-sami-prefix', 'inari-sami-prefix',
'skolt-sami-prefix', and 'kildin-sami-prefix'.

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** Japanese environments use UTF-8 by default.
In Japanese environments that do not specify encodings and are not
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based on MS-Windows, the default encoding is now utf-8 instead of
japanese-iso-8bit.

** New function 'exec-path'.
This function by default returns the value of the corresponding
user option, but can optionally return the equivalent of 'exec-path'
from a remote host.

** The function 'executable-find' supports an optional argument REMOTE.
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This triggers searching for the program on the remote host as indicated by
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'default-directory'.

** New user option 'auto-save-no-message'.
When set to t, no message will be shown when auto-saving (default
value: nil).

** The value of 'make-cursor-line-fully-visible' can now be a function.
In addition to nil or non-nil, the value can now be a predicate
function.  Follow mode uses this to control scrolling of its windows
when the last screen line in a window is not fully visible.

** New variable 'emacs-repository-branch'.
It reports the git branch from which Emacs was built.

** New user option 'switch-to-buffer-obey-display-actions'.
When non-nil, 'switch-to-buffer' uses 'pop-to-buffer-same-window' that
respects display actions specified by 'display-buffer-alist' and
'display-buffer-overriding-action'.

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** The user option 'switch-to-visible-buffer' is now obsolete.
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Customize 'switch-to-prev-buffer-skip' instead.

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** New user option 'switch-to-prev-buffer-skip'.
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This user option allows specifying the set of buffers that may be
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shown by 'switch-to-prev-buffer' and 'switch-to-next-buffer' more
stringently than the now obsolete 'switch-to-visible-buffer'.
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** New 'flex' completion style.
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An implementation of popular "flex/fuzzy/scatter" completion which
matches strings where the pattern appears as a subsequence.  Put
simply, makes "foo" complete to both "barfoo" and "frodo".  Add 'flex'
to 'completion-styles' or 'completion-category-overrides' to use it.

** The 'completion-common-part' face is now visible by default.

** New face attribute ':extend' to control face extension at EOL.
The new face attribute ':extend' controls whether to use the face for
displaying the empty space beyond end of line (EOL) till the edge of
the window.  By default, this attribute is non-nil only for a small
number of faces, notably, 'region'; any other face that crosses end of
line will not affect the display of the empty space at EOL.  This is
to make Emacs behave more like other GUI applications with respect to
displaying faces that cross line boundaries.

This attribute behaves specially when theme definitions are applied:
if the theme doesn't specify an explicit value of this attribute for a
face, the value from the original face definition is inherited.
Consequently, a theme generally shouldn't specify this attribute
unless it has a good reason to do so.

** Connection-local variables
*** Connection-local variables are applied by default like file-local
and directory-local variables.

*** The macro 'with-connection-local-variables' has been renamed from
'with-connection-local-profiles'.  No argument PROFILES needed any longer.

** New user option 'next-error-verbose' controls when 'next-error'
outputs a message about the error locus.

** New user option 'grep-search-path' defines the directories searched for
grep hits (this used to be controlled by 'compilation-search-path').

** New user option 'emacs-lisp-compilation-search-path' defines the
directories searched for byte-compiler error messages (this used to
be controlled by 'compilation-search-path').

** Multicolor fonts such as "Noto Color Emoji" can be displayed on
Emacs configured with Cairo drawing and linked with cairo >= 1.16.0.

** Emacs now optionally displays a fill column indicator.
This is similar to what 'fill-column-indicator' package provides, but
much faster and compatible with 'show-trailing-whitespace'.

Customize the buffer-local user options 'display-fill-column-indicator'
and 'display-fill-column-indicator-character' to activate the
indicator.

The indicator is not displayed at all in minibuffer windows and
in tooltips, as it is not useful there.

There are 2 new buffer local variables and 1 face to customize this
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mode, they are described in the manual "(emacs) Display".
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** 'progress-reporter-update' now accepts an optional suffix string to display.
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** New user option 'xref-file-name-display' controls the display of
file names in xref buffers.

** New user option 'byte-count-to-string-function'.
It is used for displaying file sizes and disk space in some cases.

** Emacs now interprets RGB triplets like HTML, SVG, and CSS do.
The X convention previously used differed slightly, particularly for
RGB triplets with a single hexadecimal digit per component.

** The toolbar now shows the equivalent key binding in its tooltips.

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** The File menu-bar menu was re-arranged.
Print menu items moved to submenu, and also added the new entries for tabs.
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** 'scroll-lock-mode' is now bound to the 'Scroll_Lock' key globally.
Note that this key binding will not work on MS-Windows systems if
'w32-scroll-lock-modifier' is non-nil.

** 'global-set-key', called interactively, now no longer downcases a
key binding with an upper case letter - if you can type it, you can
bind it.

** 'read-from-minibuffer' now works with buffer-local history variables.
The HIST argument of 'read-from-minibuffer' now works correctly with
buffer-local variables.  This means that different buffers can have
their own separated input history list if desired.

** 'backup-by-copying-when-privileged-mismatch' applies to file gid, too.
In addition to checking the file owner uid, Emacs also checks that the
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group gid is not greater than 'backup-by-copying-when-privileged-mismatch';
if so, 'backup-by-copying-when-mismatch' will be forced on.
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* Editing Changes in Emacs 27.1

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** When asked to visit a large file, Emacs now offers to visit it literally.
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Previously, Emacs would only ask for confirmation before visiting
large files.  Now it also offers a third alternative: to visit the
file literally, as in 'find-file-literally', which speeds up
navigation and editing of large files.

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** 'zap-to-char' now uses the history of characters you used to zap to.
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'zap-to-char' uses the new 'read-char-from-minibuffer' function to allow
navigating through the history of characters that have been input.
This is mostly useful for characters that have complex input methods
where inputting the character again may involve many keystrokes.

** 'save-some-buffers' now has a new action in the prompt: 'C-f' will
exit the command and switch to the buffer currently being asked about.

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** More commands support noncontiguous rectangular regions, namely
'upcase-dwim', 'downcase-dwim', 'capitalize-dwim', 'capitalize-region',
'upcase-initials-region', 'replace-string', 'replace-regexp', and
'delimit-columns-region'.

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** The new 'amalgamating-undo-limit' variable can be used to control
how many changes should be amalgamated when using the 'undo' command.

** The 'newline-and-indent' command (commonly bound to 'RET' in many
modes) now takes an optional numeric argument to specify how many
times is should insert newlines (and indent).

** New command 'make-empty-file'.

** New variable 'x-wait-for-event-timeout'.
This controls how long Emacs will wait for updates to the graphical
state to take effect (making a frame visible, for example).

** New user option 'electric-quote-replace-double'.
This option controls whether '"' is replaced in 'electric-quote-mode',
in addition to other quote characters.  If non-nil, ASCII double-quote
characters that quote text "like this" are replaced by double
typographic quotes, “like this”, in text modes, and in comments in
non-text modes.

** New user option 'flyspell-case-fold-duplications'.
This option controls whether Flyspell mode considers consecutive words
to be duplicates if they are not in the same case.  If non-nil, the
default, words are considered to be duplicates even if their letters'
case does not match.

** 'write-abbrev-file' now includes special properties.
'write-abbrev-file' now writes special properties like ':case-fixed'
for abbrevs that have them.

** 'write-abbrev-file' skips empty tables.
'write-abbrev-file' now skips inserting a 'define-abbrev-table' form for
tables which do not have any non-system abbrevs to save.

** The new functions and commands 'text-property-search-forward' and
'text-property-search-backward' have been added.  These provide an
interface that's more like functions like 'search-forward'.

** 'add-dir-local-variable' now uses dotted pair notation syntax to
write alists of variables to ".dir-locals.el".  This is the same
syntax that you can see in the example of a ".dir-locals.el" file in
the node "(emacs) Directory Variables" of the user manual.

** Network connections using 'local' can now use IPv6.
'make-network-process' now uses the correct loopback address when
asked to use ':host 'local' and ':family 'ipv6'.

** The new function 'replace-region-contents' replaces the current
region using a given replacement-function in a non-destructive manner
(in terms of 'replace-buffer-contents').

** The command 'replace-buffer-contents' now has two optional
arguments mitigating performance issues when operating on huge
buffers.

** Dragging 'C-M-mouse-1' now marks rectangular regions.

** The command 'delete-indentation' now operates on the active region.
If the region is active, the command joins all the lines in the
region.  When there's no active region, the command works on the
current and the previous or the next line, as before.

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** You can now change the font size with the mouse wheel.
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Scrolling the mouse wheel with the Ctrl key pressed will now act the
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same as the 'C-x C-+' and 'C-x C--' commands.

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* Changes in Specialized Modes and Packages in Emacs 27.1

** New HTML mode skeleton 'html-id-anchor'.
This new command (which inserts an <a id="foo">_</a> skeleton) is
bound to 'C-c C-c #'.

** New command 'font-lock-refontify'.
This is an interactive convenience function to be used when developing
font locking for a mode.  It recomputes the font locking data and then
re-fontifies the buffer.

** Font Lock is smarter about fontifying unterminated strings and comments.
When you type a quote that starts a string, or a comment delimiter
that starts a comment, font-lock will not immediately refontify the
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following characters in 'font-lock-string-face' or
'font-lock-comment-face'.  Instead, it will delay the fontification
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beyond the current line to give you a chance to close the string or
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comment.  This is controlled by the new user option
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'jit-lock-antiblink-grace', which specifies the delay in seconds.  The
default is 2 seconds; set to nil to get back the old behavior.

** The 'C' command in 'tar-mode' will now preserve the timestamp of
the extracted file if the new user option 'tar-copy-preserve-time' is
non-nil.

** 'autoconf-mode' is now used instead of 'm4-mode' for the
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"acinclude.m4" / "aclocal.m4" / "acsite.m4" files.
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** On GNU/Linux, 'M-x battery' will now list all batteries, no matter
what they're named, and the 'battery-linux-sysfs-regexp' variable has
been removed.

** The 'list-processes' command now includes port numbers in the
network connection information (in addition to the host name).

** The 'cl' package is now officially deprecated in favor of 'cl-lib'.

** desktop
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*** When called interactively with a prefix arg 'C-u', 'desktop-read'
now prompts the user for the directory containing the desktop file.

** display-line-numbers-mode

*** New faces 'line-number-major-tick' and 'line-number-minor-tick',
and user options 'display-line-numbers-major-tick' and
'display-line-numbers-minor-tick' can be used to highlight the line
numbers of lines multiple of certain numbers.

*** New variable 'display-line-numbers-offset', when non-zero, adds
an offset to absolute line numbers.

** winner
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*** A new user option, 'winner-boring-buffers-regexp', has been added.

** table
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*** 'table-generate-source' now supports wiki and mediawiki.
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This command can now output wiki and mediawiki format tables.
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** telnet-mode
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*** Reverting a buffer in 'telnet-mode' will restart a closed connection.

** goto-addr
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*** A way to more conveniently specify what URI address schemes should
be ignored has been added via the 'goto-address-uri-schemes-ignored'
variable.
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** tex-mode
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*** 'latex-noindent-commands' controls indentation of certain commands.
You can use this new user option to control indentation of arguments of
\emph, \footnote, and similar commands.

** byte compiler
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*** 'byte-compile-dynamic' is now obsolete.
This is because on the one hand it suffers from misbehavior in corner
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cases that have plagued it for years, and on the other hand experience
indicates that it doesn't bring any measurable benefit.
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*** The 'g' keystroke in "*Compile-Log*" buffers has been bound to a
new command that will recompile the file previously compiled with 'M-x
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byte-compile-file' and the like.

** compile.el
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*** In 'compilation-error-regexp-alist', 'line' (and 'end-line') can
be functions.
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*** 'compilation-context-lines' can now take the value t; this is like
nil, but instead of scrolling the current line to the top of the
screen when there is no left fringe, it inserts a visible arrow before
column zero.
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*** The new 'compilation-transform-file-match-alist' user option can
be used to transform file name matches compilation output, and remove
known false positives being recognized as warnings/errors.

** cl-lib.el
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*** 'cl-defstruct' has a new ':noinline' argument to prevent inlining
its functions.

*** 'cl-defstruct' slots accept a ':documentation' property.

*** 'cl-values-list' will now signal an error if its argument isn't a list.

** doc-view.el
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*** New commands 'doc-view-presentation' and 'doc-view-fit-window-to-page'.
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*** Added support for password-protected PDF files.
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*** A new user option 'doc-view-pdftotext-program-args' has been added
to allow controlling how the conversion to text is done.

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*** The prefix key 's' was changed to 'c' for slicing commands
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to avoid conflicts with 'image-mode' key 's'.  The new key 'c' still
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has good mnemonics of "cut", "clip", "crop".

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** Ido
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*** New user option 'ido-big-directories' to mark directories whose
names match certain regular expressions as big.  Ido won't attempt to
list the contents of such directories when completing file names.

** Minibuffer

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*** New user option 'minibuffer-beginning-of-buffer-movement'.
This option allows control of how the 'M-<' command works in
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the minibuffer.  If non-nil, point will move to the end of the prompt
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(if point is after the end of the prompt).  The default is nil, which
preserves the original behavior of 'M-<' moving to the beginning of
the prompt.
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*** When the minibuffer is active, echo-area messages are displayed at
the end of the minibuffer instead of hiding the minibuffer by the echo
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area display.  The new user option 'minibuffer-message-clear-timeout'
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controls how messages displayed in this situation are removed from the
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minibuffer.  To revert to previous behavior, where echo-area messages
temporarily overwrote the minibuffer contents until the user typed
something, set 'set-message-function' and 'clear-message-function' to
nil.
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*** Minibuffer now uses 'minibuffer-message' to display error messages
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at the end of the active minibuffer.  To disable this, remove
'minibuffer-error-initialize' from 'minibuffer-setup-hook'.
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*** 'y-or-n-p' now uses the minibuffer to read 'y' or 'n' answer.

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*** Some commands that previously used 'read-char-choice' now read
a character using the minibuffer by 'read-char-from-minibuffer'.
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** map.el
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*** Now also understands plists.
*** Now defined via generic functions that can be extended via 'cl-defmethod'.
*** Deprecate the 'map-put' macro in favor of a new 'map-put!' function.
*** 'map-contains-key' now returns a boolean rather than the key.
*** Deprecate the 'testfn' args of 'map-elt' and 'map-contains-key'.
*** New generic function 'map-insert'.
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*** The 'type' arg can be a list '(hash-table :key1 VAL1 :key2 VAL2 ...)'.
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** seq.el
New convenience functions 'seq-first' and 'seq-rest' give easy access
to respectively the first and all but the first elements of sequences.

The new predicate function 'seq-contains-p' should be used instead of
the now obsolete 'seq-contains'.

** Follow mode
In the current follow group of windows, "ghost" cursors are no longer
displayed in the non-selected follow windows.  To get the old behavior
back, customize 'follow-hide-ghost-cursors' to nil.

** New variable 'warning-fill-column' for 'display-warning'.

** Windmove

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*** 'windmove-create-window' when non-nil makes a new window.
This happens upon moving off the edge of the frame.
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*** Windmove supports directional window display and selection.
The new command 'windmove-display-default-keybindings' binds default
keys with provided modifiers (by default, Shift-Meta) to the commands
that display the next buffer in the window at the specified direction.
This is like 'windmove-default-keybindings' that binds keys to commands
that select the window in the specified direction, but additionally it
displays the buffer from the next command in that window.  For example,
'S-M-right C-h i' displays the "*Info*" buffer in the right window,
creating the window if necessary.  A special key can be customized to
display the buffer in the same window, for example, 'S-M-0 C-h e'
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displays the "*Messages*" buffer in the same window.  'S-M-t C-h r'
displays the Emacs manual in a new tab.
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*** Windmove also supports directional window deletion.
The new command 'windmove-delete-default-keybindings' binds default
keys with provided prefix (by default, 'C-x') and modifiers (by default,
'Shift') to the commands that delete the window in the specified
direction.  For example, 'C-x S-down' deletes the window below.
With a prefix arg 'C-u', also kills the buffer in that window.
With 'M-0', deletes the selected window and selects the window
that was in the specified direction.

*** New command 'windmove-swap-states-in-direction' binds default keys
to the commands that swap the states of the selected window with the
window in the specified direction.

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*** Windmove code no longer used is now obsolete.
That includes the user option 'windmove-window-distance-delta' and the
functions 'windmove-coord-add', 'windmove-constrain-to-range',
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'windmove-constrain-around-range', 'windmove-frame-edges',
'windmove-constrain-loc-for-movement', 'windmove-wrap-loc-for-movement',
'windmove-reference-loc' and 'windmove-other-window-loc'.

** Octave mode
The mode is automatically enabled in files that start with the
'function' keyword.

** project.el

*** New commands 'project-search' and 'project-query-replace-regexp'.
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*** New user option 'project-read-file-name-function'.

** Etags

*** 'next-file' is now an obsolete alias of 'tags-next-file'.

*** 'tags-loop-revert-buffers' is an obsolete alias of
'fileloop-revert-buffers'.

*** The 'tags-loop-continue' function along with the
'tags-loop-operate' and 'tags-loop-scan' variables are now obsolete;
use the new 'fileloop-initialize' and 'fileloop-continue' functions
instead.

*** etags is now able to read Zstandard-compressed files.

** bibtex

*** New commands 'bibtex-next-entry' and 'bibtex-previous-entry'.
In 'bibtex-mode-map', 'forward-paragraph' and 'backward-paragraph' are
remapped to these, respectively.

** Dired

*** New command 'dired-create-empty-file'.

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*** New command 'dired-number-of-marked-files'.
It is by default bound to '* N'.
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*** The marking commands now report how many files were marked by the
command itself, not how many files are marked in total.

*** The new user option 'dired-create-destination-dirs' controls whether
'dired-do-copy' and 'dired-rename-file' should create non-existent
directories in the destination.

*** 'dired-dwim-target' can be customized to prefer either the next window,
or one of the most recently visited windows with a Dired buffer.

*** When the new user option 'dired-vc-rename-file' is non-nil,
Dired performs file renaming using underlying version control system.

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*** Zstandard compression is now supported for 'dired-do-compress' and
'dired-do-compress-to'.

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*** On systems that support suid/guid files, Dired now fontifies the
permissions of such files with a special face 'dired-set-id'.

*** A new face, 'dired-special', is used to highlight sockets, named
pipes, block devices and character devices.

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** Find-Dired

*** New user option 'find-dired-refine-function'.
The default value is 'find-dired-sort-by-filename'.

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*** New sorting options for the user option 'find-ls-option'.
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** Change Logs and VC

*** New user option 'vc-tor'.
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When non-nil, this user option causes the VC commands to communicate
with the repository via Tor's proxy, using the 'torsocks' wrapper
script.  The default is nil.
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*** New command 'log-edit-generate-changelog-from-diff', bound to 'C-c C-w'.
This generates ChangeLog entries from the VC fileset diff.

*** Recording ChangeLog entries doesn't require an actual file.
If a ChangeLog file doesn't exist, and if the new user option
'add-log-dont-create-changelog-file' is non-nil (which is the
default), commands such as 'C-x 4 a' will add log entries to a
suitable named temporary buffer.  (An existing ChangeLog file will
still be used if it exists.)  Set the user option to nil to get the
previous behavior of always creating a buffer that visits a ChangeLog
file.

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*** The new 'd' command ('vc-dir-clean-files') in 'vc-dir-mode'
buffers will delete the marked files (or if no files are marked, the
file under point).  This command does not notify the VC backend, and
is mostly useful for unregistered files.
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*** 'vc-dir-ignore' now takes a prefix argument to ignore all marked files.

*** New user option 'vc-git-grep-template'.
This new user option allows customizing the default arguments passed to
'git-grep' when 'vc-git-grep' is used.

*** Command 'vc-git-stash' now respects marks in the "*vc-dir*" buffer.
When some files are marked, only those are stashed.
When no files are marked, all modified files are stashed, as before.

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*** 'vc-dir' now shows a button allowing you to hide the stash list.
Controlled by user option 'vc-git-show-stash'.  Default t means show
the entire list as before.  An integer value limits the list length
(but still allows you to show the entire list via the button).

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*** 'vc-git-stash' is now bound to 'C' in the stash headers.
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--
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*** Some stash keybindings are now available in the stash button.
'vc-git-stash' and 'vc-git-stash-snapshot' can now be run using 'C'
and 'S' respectively, including when there are no stashes.

*** The new hook 'vc-retrieve-tag-hook' runs after retrieving a tag.

*** 'vc-hg' now invokes 'smerge-mode' when visiting files.
Code that attempted to invoke 'smerge-mode' when visiting an Hg file
with conflicts existed in earlier versions of Emacs, but incorrectly
never detected a conflict due to invalid assumptions about cached
values.

*** The Hg (Mercurial) back-end now supports 'vc-region-history'.
The 'C-x v h' command now works in buffers that visit files controlled
by Hg.

*** The Hg (Mercurial) back-end now prompts for revision to merge when
you invoke 'C-x v m' ('vc-merge').

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*** The Hg (Mercurial) back-end now uses tags, branches and bookmarks
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instead of revision numbers as completion candidates when it prompts
for a revision.

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*** New user option 'vc-hg-revert-switches'.
It specifies switches to pass to Hg's 'revert' command.
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*** 'C-u C-x v D' ('vc-root-version-diff') prompts for two revisions
and compares their entire trees.

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*** 'C-x v M D' ('vc-diff-mergebase') and 'C-x v M L' ('vc-log-mergebase')
print diffs and logs between the merge base (common ancestor) of two
given revisions.

*** New command 'vc-log-search' asks for a pattern, searches it
in the revision log, and displays matched log entries in the
log buffer.  For example, 'M-x vc-log-search RET bug#36644 RET'
displays all entries whose log messages match the bug number.
With a prefix argument asks for a command, so for example,
'C-u M-x vc-log-search RET git log -1 f302475 RET' will display
just one log entry found by its revision number.

*** It is now possible to display a specific revision given by its ID.
If you invoke 'C-x v L' ('vc-print-root-log') with a numeric argument
of 1, as in 'C-1 C-x v L' or 'C-u 1 C-x v L', it asks for a revision
ID, and shows its log entry together with the diffs introduced by the
revision's commit.  (For some less capable VCSes, only the log entry
is shown.)

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*** New user option 'vc-find-revision-no-save'.
With non-nil, 'vc-find-revision' doesn't write the created buffer to file.

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*** 'C-x v =' can now mimic Magit's diff format.
Set the new user option 'diff-font-lock-prettify' to t for that, see
below under "Diff mode".

*** The 'diff' function arguments OLD and NEW may each be a buffer
rather than a file, in non-interactive calls.  This change was made in
Emacs 24.1, but wasn't documented until now.

*** New command 'diff-buffers' interactively diffs two buffers.

** Diff mode
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*** Hunks are now automatically refined by font-lock.
To disable refinement, set the new user option 'diff-refine' to nil.
To get back the old behavior where hunks are refined as you navigate
through a diff, set 'diff-refine' to the symbol 'navigate'.

*** 'diff-auto-refine-mode' is deprecated in favor of 'diff-refine'.
It is no longer enabled by default and binding it no longer has any
effect.

*** Better syntax highlighting of Diff hunks.
Fragments of source in Diff hunks are now by default highlighted
according to the appropriate major mode.  Customize the new user
option 'diff-font-lock-syntax' to nil to disable this.

*** File headers can be shortened, mimicking Magit's diff format.
To enable it, set the new user option 'diff-font-lock-prettify' to t.
On GUI frames, this option also displays the insertion and deletion
indicators on the left fringe.

*** Prefix arg of 'diff-goto-source' means jump to the old revision
of the file under version control if point is on an old changed line,
or to the new revision of the file otherwise.

** Texinfo

*** New function for inserting '@pxref', '@xref', or '@ref' commands.
The function 'texinfo-insert-dwim-@ref', bound to 'C-c C-c r' by
default, inserts one of three types of references based on the text
surrounding point, namely '@pxref' near a parenthesis, '@xref' at the
start of a sentence or at '(point-min)', else '@ref'.

** Browse-url

*** The function 'browse-url-emacs' can now visit a URL in selected window.
It now treats the optional 2nd argument to mean that the URL should be
shown in the currently selected window.

*** A new function, 'browse-url-add-buttons' can be used to add clickable
links to most ordinary special-mode buffers that display text that
have URLs embedded.  'browse-url-button-regexp' controls what's
considered a button.

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*** New user option 'browse-url-secondary-browser-function'.
It can be set to a function that invokes an alternative browser.
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** Comint

*** 'send-invisible' is now an obsolete alias for 'comint-send-invisible'.
Also, 'shell-strip-ctrl-m' is declared obsolete.

*** 'C-c .' ('comint-insert-previous-argument') no longer interprets '&'.
This feature caused problems when '&&' was present in the previous
command.  Since this command emulates 'M-.' in Bash and zsh, neither
of which treats '&' specially, the feature was removed for
compatibility with these shells.

*** 'comint-insert-previous-argument' can now count arguments from the end.
By default, invoking 'C-c .' with a numeric argument N would copy the
Nth argument, counting from the first one.  But if the new user option
'comint-insert-previous-argument-from-end' is non-nil, it will copy
the Nth argument counting from the last one.  Thus 'C-c .' can now
better emulate 'M-.' in both Bash and zsh, since the former counts
from the beginning of the arguments, while the latter counts from the
end.

*** 'comint-run' can now accept a list of switches to pass to the program.
'C-u M-x comint-run' will prompt for the switches interactively.

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*** Abnormal hook 'comint-password-function' has been added.
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This hook permits a derived mode to supply a password for the
underlying command interpreter without prompting the user.  For
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example, in 'sql-mode', the password for connecting to the database may
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be stored in the connection wallet and may be passed on the command
line to start the SQL interpreter.  This is a potential security flaw
that could expose user's database passwords on the command line
through the use of a process list (Bug#8427).  With this hook, it is
possible to not pass the password on the command line and wait for the
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program to prompt for the password.  When it does so, the password can
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be supplied to the SQL interpreter without involving the user just as
if it had been supplied on the command line.

** SQL

*** SQL Indent Minor Mode
SQL Mode now supports the ELPA 'sql-indent' package for assisting
sophisticated SQL indenting rules.  Note, however, that SQL is not
like other programming languages like C, Java, or Python where code is
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sparse and rules for formatting are fairly well established.  Instead
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SQL is more like COBOL (from which it came) and code tends to be very
dense and line ending decisions driven by syntax and line length
considerations to make readable code.  Experienced SQL developers may
prefer to rely upon existing Emacs facilities for formatting code but
the 'sql-indent' package provides facilities to aid more casual SQL
developers layout queries and complex expressions.

**** 'sql-use-indent-support' (default t) enables SQL indention support.
The 'sql-indent' package from ELPA must be installed to get the
indentation support in 'sql-mode' and 'sql-interactive-mode'.

**** 'sql-mode-hook' and 'sql-interactive-mode-hook' changed.
Both hook variables have had 'sql-indent-enable' added to their
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default values.  If you have existing customizations to these
variables, you should make sure that the new default entry is
included.
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*** Connection Wallet
Database passwords can now by stored in NETRC or JSON data files that
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may optionally be encrypted.  When establishing an interactive session
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with the database via 'sql-connect' or a product specific function,
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like 'sql-mysql' or 'sql-postgres', the password wallet will be
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searched for the password.  The 'sql-product', 'sql-server',
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'sql-database', and the 'sql-username' will be used to identify the
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appropriate authorization.  This eliminates the discouraged practice of
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embedding database passwords in your Emacs initialization.

See the 'auth-source' module for complete documentation on the file
formats.  By default, the wallet file is expected to be in the
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'user-emacs-directory', named "sql-wallet" or ".sql-wallet", with
".json" (JSON) or no (NETRC) suffix.  Both file formats can optionally
be encrypted with GPG by adding an additional ".gpg" suffix.
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** Term

*** 'term-read-noecho' is now obsolete, use 'read-passwd' instead.

*** 'serial-term' now takes an optional parameter to leave the
emulator in line mode.

** Flymake

*** The variable 'flymake-diagnostic-types-alist' is obsolete.
You should instead set properties on known diagnostic symbols, like
':error' and ':warning', as demonstrated in the Flymake manual.

*** New user option 'flymake-start-on-save-buffer'.
Control whether Flymake starts checking the buffer on save.

*** Flymake and backend functions may exchange hints about buffer changes.
This enables more efficient backends.  See the docstring of
'flymake-diagnostic-functions' or the Flymake manual for details.

*** 'flymake-start-syntax-check-on-newline' is now obsolete,
use 'post-self-insert-hook' to check on newline.

** Ruby

*** The Rubocop Flymake diagnostic function will only run Lint cops if
it can't find the config file.

*** Rubocop is called with 'bundle exec' if Gemfile mentions it.

*** New command 'ruby-find-library-file' bound to 'C-c C-f'.

** Package

*** Warn if "footer line" is missing, but still install package.
package.el used to refuse to install a package without the so-called
"footer line", which appears at the very end of the file:

;;; FILENAME ends here

package.el will now install packages without this line, but it will
issue a warning.  To avoid this warning, packages should keep the
"footer line".

Note that versions of Emacs older than 27.1 will not only refuse to
install packages without such a line -- they will be unable to parse
package data.  It is therefore recommended to keep this line.

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*** Change of 'package-check-signature' for packages with multiple sigs.
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In previous Emacsen, t checked that all signatures are valid.
Now t only checks that at least one signature is valid and the new 'all'
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value needs to be used if you want to enforce that all signatures
are valid.  This only affects packages with multiple signatures.

*** The meaning of 'allow-unsigned' in 'package-check-signature' has
changed slightly: If a usable OpenPGP configuration can't be found
(for instance, if gpg isn't installed), it now has the same meaning as
nil.

*** New function 'package-get-version' lets packages query their own version.
Example use in auctex.el: '(defconst auctex-version (package-get-version))'

*** New 'package-quickstart' feature.
When 'package-quickstart' is non-nil, package.el precomputes a big
autoloads file so that activation of packages can be done much faster,
which can speed up your startup significantly.
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It also causes user options like 'package-user-dir' and
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'package-load-list' to be consulted when 'package-quickstart-refresh'
is run rather than at startup so you don't need to set them in your
early init file.

*** New function 'package-activate-all'.

*** New functions for filtering packages list.
A new function has been added which allows users to filter the
packages list by name: 'package-menu-filter-by-name'.  By default, it
is bound to '/ n'.  Additionally, the function
'package-menu-filter-by-keyword' has been renamed from
'package-menu-filter'.  Its keybinding has also been changed to '/ k'
(from 'f').  To clear any of the two filters, the user can now call
the 'package-menu-clear-filter' function, bound to '/ /' by default.

*** Imenu support has been added to 'package-menu-mode'.

*** The package list can now be sorted by version or description.

*** In Package Menu, 'g' now updates package data from archives.
Previously, 'g' invoked 'tabulated-list-revert' which did not update
the cached archive data.  It is now bound to 'revert-buffer', which
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will update the data.
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'package-menu-refresh' is an obsolete alias for 'revert-buffer'.

** Info

*** Clicking on the left/right arrow icon in the Info tool-bar while
holding down the Ctrl key pops up a menu of previously visited Info nodes
where you can select a node to go back (like in browsers).

*** Info can now follow 'file://' protocol URLs.
The 'file://' URLs in Info documents can now be followed by passing
them to the 'browse-url' function, like the other protocols: 'ftp',
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'http', and 'https'.  This allows having references to local HTML
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files, for example.

** Display of man pages now limits the width for formatting pages.
The new user option 'Man-width-max' (80 by default) limits the number
of columns passed to the 'man' program for formatting man pages.  This
is to enhance readability when man pages are displayed in very wide
windows (which are customary with today's large displays).

** Xref

*** New command 'xref-find-definitions-at-mouse'.
This command finds definitions of the identifier at the place of a
mouse click event, and is intended to be bound to a mouse event.

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*** Changing 'xref-marker-ring-length' works after xref.el is loaded.
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Previously, setting 'xref-marker-ring-length' would only take effect
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if set before xref.el was loaded.
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*** 'xref-find-definitions' now sets the mark at the buffer position
where it was invoked.

*** New xref faces 'xref-file-header', 'xref-line-number', 'xref-match'.

*** New user option 'xref-show-definitions-function'.
It encapsulates the logic pertinent to showing the result of
'xref-find-definitions'.  The user can change it to customize its
behavior and the display of results.

*** Search results show the buffer even for one hit.
The search-type Xref commands (e.g. 'xref-find-references' or
'project-find-regexp') now show the results buffer even when there is
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only one hit.  This can be altered by changing 'xref-show-xrefs-function'.
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*** Xref buffers support refreshing the search results.
A new command 'xref-revert-buffer' is bound to 'g'.

*** Imenu support has been added to 'xref--xref-buffer-mode'.

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*** New generic method 'xref-backend-identifier-completion-ignore-case'.
Using it, the etags backend now honors 'tags-case-fold-search' during
identifier completion.

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** Checkdoc

*** Checkdoc can now optionally spell-check doc strings.
Invoking 'checkdoc-buffer' with a non-nil TAKE-NOTES argument
(interactively, with a prefix arg) will now spell-check the doc
strings and report all the spelling mistakes.

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** Icomplete

*** New minor mode Fido mode.
This mode is based on Icomplete, and its name stands for "Fake Ido".
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The point of this mode is to be an 'ido-mode' workalike, providing
most of the functionality present in 'ido-mode' that is not in
Icomplete, which is much more compatible with all of Emacs's
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completion facilities.

** Ecomplete

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*** The Ecomplete sorting has changed to a decay-based algorithm.
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This can be controlled by the new 'ecomplete-sort-predicate' user option.

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*** The 'ecomplete-database-file' file is now placed in
"~/.emacs.d/ecompleterc" by default.  Of course it will still find it
if you have it in "~/.ecompleterc".
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** Gnus

*** 'mm-uu-diff-groups-regexp' now defaults to matching all groups,
which means that "git am" diffs are recognized everywhere.

*** Two new Gnus summary mode navigation commands have been added,
bound to the '[' and ']' keys: 'gnus-summary-prev-unseen-article' and
'gnus-summary-next-unseen-article'.  These take you (respectively) to
the previous unseen or next unseen article.  (These are the ones that
are marked with "." in the summary mode lines.)

*** The Gnus user variable 'nnimap-expunge' supports three new values:
'never' for never expunging messages, 'immediately' for immediately
expunging deleted messages, and 'on-exit' to expunge deleted articles
when exiting the group's summary buffer.  Setting 'nnimap-expunge' to
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nil or t is still supported but not recommended, since it may
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result in Gnus expunging all messages that have been flagged as
deleted by any IMAP client (rather than just those that have been
deleted by Gnus).

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*** New user option 'gnus-use-atomic-windows' makes Gnus window layouts atomic.
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See the "(elisp) Atomic Windows" node of the Elisp manual for details.
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*** There's a new value for 'gnus-article-date-headers',
'combined-local-lapsed', which will show both the time (in the local
timezone) and the lapsed time.

*** Gnus now maps imaps to 993 only on old MS-Windows versions.
The nnimap backend used to do this unconditionally to work around
problems on old versions of MS-Windows.  This is now done only for
Windows XP and older.

*** The nnimap backend now has support for IMAP namespaces.
This feature can be enabled by setting the new 'nnimap-use-namespaces'
server variable to non-nil.

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*** A prefix argument to 'gnus-summary-limit-to-score' will limit in reverse.
Limit to articles with score "at or below" the SCORE argument rather
than "at or above".
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*** The function 'gnus-score-find-favorite-words' has been renamed
from 'gnus-score-find-favourite-words'.

*** Gmane has been removed as an nnir backend, since Gmane no longer
has a search engine.

*** Splitting mail on common mailing list headers has been added.
See the concept index in the Gnus manual for the 'match-list' entry.

*** nil is no longer an allowed value for 'mm-text-html-renderer'.

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*** The default value of 'mm-inline-large-images' has changed from nil
to 'resize', which means that large images will be resized instead of
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displayed with an external program by default.

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*** A new Gnus summary mode command, 'S A' ('gnus-summary-attach-article')
can be used to attach the current article(s) to a pre-existing Message
buffer, or create a new Message buffer with the article(s) attached.
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*** A new Gnus summary mode command, 'w' ('gnus-summary-browse-url')
scans the article buffer for URLs, and offers them to the user to open
with 'browse-url'.
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*** New user option 'nnir-notmuch-filter-group-names-function'.
This option controls whether and how to use Gnus search groups as
'path:' search terms to 'notmuch'.

*** The buttons in the Gnus article buffer were formerly widgets
(i.e., buttons from widget.el).  This has now changed, and they are
now buttons (from button.el), and commands like 'TAB' now search for
buttons instead of widgets.  There should be no user-visible changes,
but out-of-tree code that relied on widgets being present might now
fail.

** erc

*** New hook 'erc-insert-done-hook'.
This hook is called after strings have been inserted into the buffer,
and is free to alter point and window configurations, as it's not
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called from inside a 'save-excursion', as opposed to 'erc-insert-post-hook'.
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*** 'erc-button-google-url' has been renamed to 'erc-button-search-url'
and its value has been changed to Duck Duck Go.

*** 'erc-send-pre-hook' and 'erc-send-this' have been obsoleted.
The user option to use instead to alter text to be sent is now
'erc-pre-send-functions'.

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*** Improve matching/highlighting of nicknames.
Open and close parenthesis and apostrophe are not considered valid
nick characters anymore, matching the given grammar in RFC 2812
section 2.3.1.  This enables correct matching and highlighting of
nicks when they are surrounded by parentheses, like "(nick)", and when
adjacent to an apostrophe, like "nick's".

*** Set 'erc-button-url-regexp' to 'browse-url-button-regexp'
which better handles surrounding pair of parentheses.

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*** New function 'erc-switch-to-buffer-other-window'
which is like 'erc-switch-to-buffer', but opens the buffer in another
window.

*** New function 'erc-track-switch-buffer-other-window'
which is like 'erc-track-switch-buffer', but opens the buffer in
another window.

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** EUDC

*** XEmacs support has been removed.

** eww/shr

*** The new user option 'shr-cookie-policy' can be used to control
when to use cookies when fetching embedded images.  The default is to
use them when the images are from the same domain as the main HTML
document.

*** The 'eww' command can now create a new EWW buffer.
Invoking the command with a prefix argument will cause it to create a
new EWW buffer for the URL instead of reusing the default one.

*** Clicking with the Ctrl key or 'C-u RET' on a link opens a new tab
when tab-bar-mode is enabled.

*** The 'd' ('eww-download') command now falls back to current page's URL.
If this command is invoked with no URL at point, it now downloads the
current page instead of signaling an error.

*** When opening external links in eww/shr (typically with the
'C-u RET' keystroke on a link), the link will be flashed with the new
'shr-selected-link' face to give the user feedback that the command
has been executed.

*** New user option 'shr-discard-aria-hidden'.
If set, shr will not render tags with attribute 'aria-hidden="true"'.
This attribute is meant to tell screen readers to ignore a tag.

*** 'shr-external-browser' has been made into an obsolete alias
of 'browse-url-secondary-browser-function'.

*** 'shr-tag-ol' now respects the ordered list 'start' attribute.

*** The following tags are now handled: '<code>', '<abbr>', and '<acronym>'.

** Htmlfontify

*** The functions 'hfy-color', 'hfy-color-vals' and
'hfy-fallback-color-values' and the variables 'hfy-fallback-color-map'
and 'hfy-rgb-txt-color-map' have been renamed from names that used
'colour' instead of 'color'.

** Enriched mode supports the 'charset' text property.
You can add or modify the 'charset' text properties of text using the
'Edit->Text Properties->Special Properties' menu, or by invoking the
'facemenu-set-charset' command.  Documents in Enriched mode will be
saved with the charset properties, and those properties will be
restored when the file is visited.

** Smtpmail

*** Authentication mechanisms can be added via external packages, by
defining new 'cl-defmethod' of 'smtpmail-try-auth-method'.

*** To always force smtpmail to send credentials over on the first
attempt when communicating with the SMTP server(s), the
'smtpmail-servers-requiring-authorization' user option can be used.

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*** smtpmail will now try resending mail when getting a transient "4xx"
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error message from the SMTP server.  The new 'smtpmail-retries'
user option says how many times to retry.

** Footnote mode

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*** Support Hebrew-style footnotes.
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*** Footnote text lines are now aligned.
Can be controlled via the new user option 'footnote-align-to-fn-text'.

** CSS mode

*** A new command 'css-cycle-color-format' for cycling between color
formats (e.g. "black" => "#000000" => "rgb(0, 0, 0)") has been added,
bound to 'C-c C-f'.

*** CSS mode, SCSS mode, and Less CSS mode now have support for Imenu.

** SGML mode

*** 'sgml-quote' now handles double quotes and apostrophes
when escaping text and in addition all numeric entities when
unescaping text.

** Python mode

*** Python mode supports three different font lock decoration levels.
The maximum level is used by default; customize
'font-lock-maximum-decoration' to tone down the decoration.

*** New user option 'python-pdbtrack-kill-buffers'.
If non-nil, the default, buffers opened during pdbtracking session are
killed when pdbtracking session is finished.

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*** New function 'python-shell-send-statement.
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It sends the statement delimited by 'python-nav-beginning-of-statement'
and 'python-nav-end-of-statement' to the inferior Python process.
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** Help

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*** Descriptions of variables and functions give an estimated first release
where the variable or function appeared in Emacs.
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*** Output format of 'C-h l' ('view-lossage') has changed.
For convenience, 'view-lossage' now displays the last keystrokes
and commands in the same format as the edit buffer of
'edit-last-kbd-macro'.  This makes it possible to copy the lines from
the buffer generated by 'view-lossage' to the "*Edit Macro*" buffer
created by 'edit-last-kbd-macro', and to save the macro by 'C-c C-c'.

*** The list of help commands produced by 'C-h C-h' ('help-for-help')
can now be searched via 'C-s'.

** Ibuffer

*** New filter 'ibuffer-filter-by-process'; bound to '/ E'.

*** All mode filters can now accept a list of symbols.
This means you can now easily filter several major modes, as well
as a single mode.

** Search and Replace

*** Isearch supports a prefix argument for 'C-s' ('isearch-repeat-forward')
and 'C-r' ('isearch-repeat-backward').  With a prefix argument, these
commands repeat the search for the specified occurrence of the search string.
A negative argument repeats the search in the opposite direction.
This makes possible also to use a prefix argument for 'M-s .'
('isearch-forward-symbol-at-point') to find the next Nth symbol.
Also a prefix argument is supported for 'isearch-yank-until-char',
'isearch-yank-word-or-char', 'isearch-yank-symbol-or-char'.

*** To go to the first/last occurrence of the current search string
is possible now with new commands 'isearch-beginning-of-buffer' and
'isearch-end-of-buffer' bound to 'M-s M-<' and 'M-s M->' in Isearch.
With a numeric argument, they go to the Nth absolute occurrence
counting from the beginning/end of the buffer.  This complements
'C-s'/'C-r' that searches for the next Nth relative occurrence
with a numeric argument.

*** 'isearch-lazy-count' shows the current match number and total number
of matches in the Isearch prompt.  User options
'lazy-count-prefix-format' and 'lazy-count-suffix-format' define the
format of the current and the total number of matches in the prompt's
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prefix and suffix, respectively.
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*** 'lazy-highlight-buffer' highlights matches in the full buffer.
It is useful in combination with 'lazy-highlight-cleanup' customized to nil
to leave matches highlighted in the whole buffer after exiting isearch.
Also when 'lazy-highlight-buffer' prepares highlighting in the buffer,
navigation through the matches without flickering is more smooth.
'lazy-highlight-buffer-max-at-a-time' controls the number of matches to
highlight in one iteration while processing the full buffer.

*** New isearch bindings.
'C-M-z' invokes new function 'isearch-yank-until-char', which yanks
everything from point up to but not including the specified
character into the search string.  This is especially useful for
keyboard macros.

'C-M-w' in isearch changed from 'isearch-del-char' to the new function
'isearch-yank-symbol-or-char'.  'isearch-del-char' is now bound to
'C-M-d'.

'M-s h l' invokes 'highlight-lines-matching-regexp' using the search
string to highlight lines matching the search string.  This is similar
to the existing binding 'M-s h r' ('highlight-regexp') that highlights
JUST the search string.

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*** New user option 'isearch-yank-on-move' provides options t and 'shift'
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to extend the search string by yanking text that ends at the new
position after moving point in the current buffer.  'shift' extends
the search string by motion commands while holding down the shift key.

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*** 'isearch-allow-scroll' provides a new option 'unlimited' to allow
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scrolling any distance off screen.

*** Isearch now remembers the regexp-based search mode for words/symbols
and case-sensitivity together with search strings in the search ring.

*** Isearch now has its own tool-bar and menu-bar menu.

*** 'flush-lines' prints and returns the number of deleted matching lines.

*** 'char-fold-to-regexp' now matches more variants of a base character.
The table used to check for equivalence of characters is now built
using the complete chain of unicode decompositions of a character,
rather than stopping after one level, such that searching for
e.g. "GREEK SMALL LETTER IOTA" will now also find "GREEK SMALL LETTER
IOTA WITH OXIA".

*** New char-folding options: 'char-fold-include' lets you add ad hoc
foldings, 'char-fold-exclude' to remove foldings from default decomposition,
and 'char-fold-symmetric' to search for any of an equivalence class of
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characters.  For example, with a nil value of 'char-fold-symmetric'
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you can search for "e" to find "é", but not vice versa.  With a non-nil
value you can search for either, for example, you can search for "é"
to find "e".

** Debugger

*** The Lisp Debugger is now based on 'backtrace-mode'.
Backtrace mode adds fontification and commands for changing the
appearance of backtrace frames.  See the node "(elisp) Backtraces" in
the Elisp manual for documentation of the new mode and its commands.

** Edebug

*** 'edebug-eval-last-sexp' and 'edebug-eval-print-last-sexp' interactively
now take a zero prefix analogously to the non-Edebug counterparts.

*** New faces 'edebug-enabled-breakpoint' and 'edebug-disabled-breakpoint'.
When setting breakpoints in Edebug, an overlay with these faces are
placed over the point in question, depending on whether they are
enabled or not.

*** New command 'edebug-toggle-disable-breakpoint'.
This command allows you to disable a breakpoint temporarily.  This is
mainly useful with breakpoints that are conditional and would take
some time to recreate.

*** New command 'edebug-unset-breakpoints'.
To clear all breakpoints in the current form, the 'U' command in
'edebug-mode', or 'M-x edebug-unset-breakpoints' can be used.

*** Re-instrumenting a function with Edebug will now try to preserve
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previously-set breakpoints.  However, if the code has changed
substantially, this may not be possible.
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*** New command 'edebug-remove-instrumentation'.
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This command removes Edebug instrumentation from all functions that
have been instrumented.

*** The runtime behavior of Edebug's instrumentation can be changed
using the new variables 'edebug-behavior-alist',
'edebug-after-instrumentation-function' and
'edebug-new-definition-function'.  Edebug's behavior can be changed
globally or for individual definitions.

*** Edebug's backtrace buffer now uses 'backtrace-mode'.
Backtrace mode adds fontification, links and commands for changing the
appearance of backtrace frames.  See the node "(elisp) Backtraces" in
the Elisp manual for documentation of the new mode and its commands.

The binding of 'd' in Edebug's keymap is now 'edebug-pop-to-backtrace'
which replaces 'edebug-backtrace'.  Consequently Edebug's backtrace
windows now behave like those of the Lisp Debugger and of ERT, in that
when they appear they will be the selected window.

The new 'backtrace-goto-source' command, bound to 's', works in
Edebug's backtraces on backtrace frames whose source code has
been instrumented by Edebug.

** Enhanced xterm support

*** New user option 'xterm-set-window-title' controls whether Emacs sets
the XTerm window title.  This feature is experimental and is disabled
by default.

** Grep

*** 'rgrep', 'lgrep' and 'zrgrep' now hide part of the command line
that contains a list of ignored directories and files.
Clicking on the button with ellipsis unhides it.
The abbreviation can be disabled by the new user option
'grep-find-abbreviate'.  The new command
'grep-find-toggle-abbreviation' toggles it interactively.

*** 'grep-find-use-xargs' is now customizable with sorting options.

** ERT

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*** New variable 'ert-quiet' allows making ERT output in batch mode
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less verbose by removing non-essential information.

*** ERT's backtrace buffer now uses 'backtrace-mode'.
Backtrace mode adds fontification and commands for changing the
appearance of backtrace frames.  See the node "(elisp) Backtraces" in
the Elisp manual for documentation of the new mode and its commands.

** Gamegrid

*** Gamegrid now determines its default glyph size based on display
dimensions, instead of always using 16 pixels.  As a result, Tetris,
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Snake and Pong are better playable on HiDPI displays.
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*** 'gamegrid-add-score' can now sort scores from lower to higher.
This is useful for games where lower scores are better, like time-based games.

** Filecache

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*** Completing file names in the minibuffer via 'C-TAB' now uses the
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styles as configured by the user option 'completion-styles'.

** New macros 'thunk-let' and 'thunk-let*'.
These macros are analogue to 'let' and 'let*', but create bindings that
are evaluated lazily.

** next-error

*** New user option 'next-error-find-buffer-function'.
The value should be a function that determines how to find the
next buffer to be used by 'next-error' and 'previous-error'.  The
default is to use the last buffer that navigated to the current
error.

*** New command 'next-error-select-buffer'.
It can be used to set any buffer as the next one to be used by
'next-error' and 'previous-error'.

** nxml-mode

*** The default value of 'nxml-sexp-element-flag' is now t.
This means that pressing 'C-M-SPACE' now selects the entire tree by
default, and not just the opening element.

** Eshell

*** TAB completion uses the standard 'completion-at-point' rather than
'pcomplete'.  Its UI is slightly different but can be customized to
behave similarly, e.g. Pcomplete's default cycling can be obtained
with '(setq completion-cycle-threshold 5)'.

*** Expansion of history event designators is disabled by default.
To restore the old behavior, use

    (add-hook 'eshell-expand-input-functions
              #'eshell-expand-history-references)